Printing telegraph apparatus



R. A. LAKE 2,303,846

PRINTING TELEGRAPH APPARATUS Dec. 1, 1942.

Original Filed May 20, 1939 2 Sheets-Sheet 1 FIG. 1 A

' FIGIZ FIG.|3 W 05 I M I "I05 :39 f A 73 80 FIG. I4 73 EM INVENTOR'.Ross A. LAKE ATTORNEY.

Dec. 1, 1942. R. A. LAKE 2,303,846

PRINTING TELEGRAPH APPARATUS Original Filed May 20, 19153 2 Sheets-Sheet2 H6 FIG. 2

- AMI 70 ll/gg y/myllllllllmwzl l 40 l l O\ I I h -J O nosd 4' 0 F167 3I I06 OOQOOOOOOOOOOQO o sgseee- 90 50 I24 I 8 OQ QOQO O INVENTOR. J0 I O01% ROSS A. LAKE I J U 26 I24 I20 HO Patented Dec. 1, i942 2,303,846lRINTING TELEGRAPH APPARATUS Ross A, Lake, Oak Park, Ill., assignor toTeletype Corporation, Chicago, Ill., a corporation or Delaware Originalapplication May 20, 1939, Serial No.

Divided and this application July 5- 1940, Serial No. M4341 2 Claims.(Cl. 197-26) The present invention relates to printing telegraphapparatus and more particularly to'improvements in printing elementstherefor.

This application is a division of'application 'Serial NO. 274,796, fliedMay 20, 1939, which eventuated into United States Patent 2,255,794,issued September 16, 1941.

The primary object of the invention is to provide a platen which isreadily interchangeable and is so arranged that the. wear thereof isspread evenly over its surface, thereby prolonging its effectiveness.

A feature of the invention resides in provid 7 ing a positionallychangeable platen wherein,

due to each printing blow, the rotational position of the platen isautomatically changed indeterminately.

A more complete understanding of the foregoing objects and features ofthe invention may be had irom the following description when taken inconjunction with the accompanying drawings, wherein likereferencecharacters 'in-. dicate the same parts throughout, and wherein, Fig. lis s. perspective view of the apparatus embodying the present invention;

of the punch blockp Fig. 6 is an enlarged plan view of the die plateaccording to the present invention;

7 is an enlarged plan view of a strip of printed tape perforated inaccordance with the method oi the present invention} Fig. 8 is anenlarged sectional view taken on line of Fig. Ff; i

Fig. 9 is an enlarged perspectivefliew of a portion oi the si controlstrip, produced soof the punch block showing'a modified form of ejector;and I Fig. 15 is an enlarged sectional view taken on line l5--li of Fig.14.

Since the disclosure herein set forth is in the nature of an improvementof the printing telegraph receiver disclosed in U. 8. Patent 1,745,833,or similar printer mechanisms operative to properly select the varioustype elements, move the tape forward, move and reverse the inking ribbon(as on a standard typewriter), and shift the platen for figure casecharacters, only so much of the mechanism of said patent will behereinafter set forth as is necessary to an understanding of the presentinvention. Reference may be had to said-patent for a full understandingof the printer mechanism not described hereinaiter in detail. A i

As disclosed in the above-mentioned patent, the platen Ii (Figs. 1. 2'and 4) over which the paper tape passes from right to left is located inthe irontand central part or the apparatus.

However, the platen used in this invention is oi 'diiie entconstruction, comprising as will hereinafter appear, a cylindricalplungercarried in a rectangular block and shiftable in the manner setforth in said patent.

Arranged above the platen ii is the ribbon feed mechanism indicatedgenerally at It, the

left spool only of which is shown in Fig. l. The

inking ribbon I5 is directed in well-known man-' semicircular in shape.Actuating bars it for opcording to the pt invention, to show a lidded vor function. As indicated-in said patent, the

aperture;

Fig. 1c is a view similar to Fig. 5 showing punch elements in operatedposition;

Fig. 11 is a sectional view taken on line H--il of Fig.5;

Fig. 12 is a view taken on line i2|2 of Fig.4 with electors removed;

Fig. 13 is an enlargedview showing the relation-between the feed holepunch and the code crating the type bars I: are located immediately ofnotches in the code bars it when the notches are selectively ali ned fora particular character actuatingbars it are articulated to the type barsI! through a gear and rack means. The selecting mechanism forselectively operating the code bars I i is of the sword-and! type, fullydisclosed in said patent. Briefly; this selector mechanism comprises aselecting or receiving 'electromagnet l'l (Figs. 1, 2 and 3), thearmature lever 18 of which comprises a selecting arm I. having abutments2i and 22 which co-operate with abutments I3 and 24 o! a series ofswords 25. The armature lever I8 is responsive under certain conditionsto *the' energization of the magnet H (for example, upon receipt ofmark-- ing or current impulses) and under other conditions to the pullof a spring 26 (for example, upon the receipt of no current or spacingimpulses), the tension of spring 26 being adjustable by means of screw21, The swords 25, of which there is a plurality corresponding in numberto the series of code bars l6, are brought into operative engagementwith the selector arm I9 by their individual operating levers 28 pivotedon a common pivot rod29. Swords 25 are pivotally articulated by a socketconnection to their individual levers 28. Each of the levers 28 isprovided with an arm 3| and is normally biased in a clockwise directionabout the pivot 29 by a spring 32. Arms 3| co-operate with a series ofhelically arranged projections 33 on a selector cam drum 34, which is'frictionally driven by a main. operating shaft 35 located in aperpendicular position at the rear and to the right of the code bars 16.The main operating shaft 35 is driven continuously by a motor 36-through a pinion 31, secured to the motor shaft 38, which pinion mesheswith a gear (not shown) operatively' associated with shaft 35.

As fully described in the aforementioned patent, the cam drum 34 isinitiated into rotationupon receipt of a starting impulse which causesthe de-energization of the magnet I1, thereby releasing the armaturelever 18 which then responds to the pull of spring 26 to rotate thelever l8 in a clockwise direction. Upon this movement, an eccentricscrew 4| (Fig. 3) co-operates with a plunger 42 which acts in the mannershown in Fig. of U. S. Patent No. 1,884,745 to release, through a leverarrangement, a stop arm (not shown) to initiate rotation of cam 34.

The speed of rotation of selector cam drum 34 is synchronized with thespeed of code impulsing so that as the armature lever I8 is operated inresponse to received impulses, a cam- 33 acts upon its associated lever28 to rock it counterclockwise (as viewed in ,Fig. 2) to bring its sword25 against selector arm l9. Sword 25 will be swung clockwise orcounterclockwise, depending on whether abutments 2i and" 23 or 22 and 24co-operate; for example, if abutments 2| and 23 co-operate, then thesword 25 will be swung in a counterclockwise direction and will assumethe position shown in Fig. 2. On the other hand, if abutments 22 and 24co-operate, then sword 25 will be swung in a clockwise direction toassume the opposite position. After the sword 25 has been set inaccordance with the nature'of the signal impulse and the cam 33 passesout of operative engagement with arm 3|, the lever 28 will be actuatedin a clockwise direction by its spring 32, carrying its associated sword25 along with it to impinge the sword 25 against arm 43 or 44' of aT-lever 45 pivoted at 46, thus rocking the T.-lever 45 in a clockwise orcounterclockwise direction. Each of the T- levers 45 is pivotallyarticulated to a code bar l6 so that when a T-lever 45 is actuated in aclockwise or counterclockwise direction, its associated code bar isactuated leftwardly or rightwardly, respectively, on studs 41 and 48.Accordingly, with the selecting mechanism just described, the code bars5 are set selectively in their rightward or leftward positions inresponse to the impulses of a code signal.

As described in Patent 1.745.633. the setting of the code bars I6 ismaintained during the printing operation by a detent or locking means.Accordingly, a locking bar 49 is provided which co-operates with bevelednotches 5| on code bars [6. Bar 49 is pivotally mounted and is movedinto and out of engagement with the code bars l6 as the striker bar ofprinting bail 52 is raised and lowered. The printing bail 52 is operatedby a printing cam (not shown) on the main shaft 35, in a mannerdescribed in Patent 1,745,633. When the printing bail 52 is in itslowermost position, it co-operates with the beveled edges 53 of the barsl4 and 49 to hold such bars out of engagement with the code bars l6 sothat the code bars l6 may be readily shifted in accordance with theoperation of the selector mechanism. When the printing bail 52 isoperated upwardly to perform the printing operation, the bars l4 and 49,due to the beveled edge 53, are permitted gradually to be actuatedtoward the code bars l6 by their individual springs 54. The actuatingbars [4 are provided with a hook portion 55 which co-operates with theprinting bail 52, which in its upward movement engages said hook portion55 to lift theactuating bar I4, which through the rack and pinionengagement with the type bar causes the type bar to rotate about itspivot to bring the type face downwardly to impinge upon the platen l I.The locking bar 49 is not provided with a hook portion 55. Its functionis merely to rock on its pivot toward and. away from the code bars Itunder the control of the printing bail 52 to lock the code bars I6 intheir set position during the printing operation.

According to the present invention the locking bar 49, while held in itsposition away from the code bars l6 when the printing bail 52 is in itslowermost position, co-operates with a series of bell cranks 56 (Fig. 2)to hold said bell cranks in counterclockwise position. Bell cranks 56are provided with shouldered portions 51 through the instrumentality ofwhich the bell cranks 56 are permitted or prevented by code bars I6 fromrotating to their clockwise position. That is, if any one of the codebars I6 is set in the position indicated in Fig. 2, and the locking bar49 is permitted to enter the V notch, the bell crank 56 associatedtherewith is blocked through the impingement of shoulder 51 upon the endof the associated code bar 16. On the other hand, if a code bar l6assumes its leftward position, the bell crank 56 associated therewithwould not be blocked, but would rotate clockwise in response to springtension hereinafter indicated and follow the movement of the locking bar49. As viewed in Fig. 1 it is observed that there is provided a bellcrank 56 for each of the code bars 16.

Co-operating with each of the bell cranks 56 is 9, vertical lever 58pivoted on a common stud 59. The uppenend of each of the levers 58co-operates with an arm of its associated bell crank 56. The lower endsof levers 58 co-operate with a'correspending series of bell cranks 6ipivotally carried on a common shaft 62. Levers 58 and 6| are pivotallymounted on a bracket 63 secured to base plate 64. The series of hellcrank levers 6| co-operates with a corresponding series of bell cranklevers 65, pivotally supported on a pivot stud 66 secured to the bracket63. The bell crank levers 65 are normally urged in a clockwise directionby individual springs 61. The springs 61 associated with the bell cranklevers 65 also serve to impart, through their cooperative relationship,rotational movement to ably arranged in a cradle 69 pivoted at II to thebracket 83 and are provided near the left-hand upper edge with acut-away portion I2 adapted to clear associated punches I3 when saidinterponents are in a certain operative position. Interponents 68terminate at the left ends thereof with an enlarged portion I4 wherebythey are adapted to co-operate with the punches"! 3 when theinterponents 88 are operated to their rightward position, as viewed inFig. 4. Cradle 69 is provided with a projection I (Fig. 12) adapted toco-operate with a feed hole punch 80 to invariably perforate a tape-feedhole in the tape I24 for each operation of the perforating mechanism.When the bell crank levers 56 are held in their counterclockwiseposition shown in Fig. 3, the interponents 88 assume their rightward ormarking position. Conversely, when the bell crank levers 56 assume theirclockwise position, interponents 68 assume their leftward or spacingposition shown in Fig. 4.

Cradle 69 is provided with an arm I projecting upwardly, to theextremity of which is pivotally connected an extensible link indicatedgenerally as I8; one end of link 16 being pivoted at 17 to arm I5 andthe other end of link I6 being pivotally connected at 18 to a perforatoroperating lever I9. In the present form of the invention, the link I6comprises one part 8| pivoted at 11 to arm I5 and a part 82 pivoted atI8 to the operating lever I9. Parts 8i and 82 are slidably connected andadjustably mounted on clamp screws 83 and 80 disposed in slots 85 and 86in part 82. Portion 82 of link I6 is provided with a pair of spaced lugs81 and 88, the portion 8| being provided with a single lug 89 adapted tobe positioned between lugs 81- and 88. In this manner, the length oflink I6 may be readily adjusted by loosening the clamp screws 83 and 84and inserting a screwdriver or similar instrument between lugs 81 and 89or 88 and 89, depending upon whether link I6 is to be lengthened orshortened, and twisting said instrument until the proper length isattained, whereafter the clamp screws are tightened.

The operating lever I9 is pivotally mounted on a pivot rod 9| supportedin arms 92 and 93 of bracket 83. As viewed in Fig. 2, the operatinglever I9 is provided with an extension 94, at the extremity of which ismounted a cam the upper surface of said guide plate. Disposed above theguide plate 98 is the die plate I05, shown in plan view in Fig. 6. Thedie plate I05 is sheared along edge I05 as to remove a portion of themetal surrounding each of the holes I01 and I08; holes I01 beingrepresentative of the code punch holes and hole I08 representing thefeed punch hole. When the die plate I05 is arranged above the die plate98, as shown in Fig. 5, the punches 13, when operated upwardly intoco-operation with the die plate I05 (as indicated in Fig. will cut awayonly a portion of the tape material, leaving a small hinge portion H0 atthe left side of the punch uncut (as viewed in Fig. '7), thus forcingthe partially perforated lid, formed by each punch, upwardly into thedie plate holes. During the punching operation, a slight tearing orshearing occurs at the point I (Figs. 7 and 9) of the hinge IIO (Fig.10), as well as a very slight stretching of the tape material. To limitthe clockwise movement of the cradle 69, a stop 39 is provided adjacentthe punch block 91. .Stop 39 is adjustably carried in cradle 69, a locknut being provided to lock said stop in adjusted position.

To minimize tearing of the tape material at the feed holes I08, the feedhole punch 80 (Fig I3 vary slightly in length, and since this variancefollower roller 95 which co-operates withthe perforator operating cam 98carried on the main operating shaft 35. A spring 90 acts upon lever I9to hold cam roller 95 against the periphery of cam 96.

Supported in the bracket 83 is a punch block indicated generally as S'Iin which is carried a series of punch elements I3. Each of the punchesI3 is provided with an enlarged section IN, the upper edge of whichco-operates with a stripper member I02 and the lower edge of whichco-operates with a backstop plate I 08. Stripper member I92 is urgeddownwardly by springs I 88, to thereby hold the punches I3 in theirlower positions free of the die plate I 05. As shown in the enlargedsectional view, Fig. 5, the punch 73 is shown fitted into a guide plate98 with its upper face disposed slightly below in length causes thesecode hole punches to penetrate various distances through the tape, therewill result (within small limits, of course) various degrees of tearingat point I20. This, however, is not detrimental in the case of the codeholes because the tape sensing pins of the tape transmitter are smallerin diameter than the code holes in the tape. The function of the tapefeed holes, on the other hand, is different in that the size and spacingof the feed holes must be practically constant, and it is desirable tominimize as far as possible any variation therein due to tearing at thehinge. It has been found that this manner of punching the feed holesassures uniform and invariable spacing thereof and hence insures properco-operation with the tape feeding mechanism of both the tape perforatorand tape transmitter.

To eject the hinged lid thus formed from the die plate I05, a strippermember I09 is provided to co-operate with each punch I8. Strippers orejectors I09 are arranged to be guided at their lower ends by the dieplate I05 and at their upper ends by a Z-shaped bracket III attached tothe plate I05, and a compression spring H2 is provided for eachejectorI09 to urge the ejectors I09 downwardly. The ejectors I09 when in theirdownward position are adapted to extend slightly below the die plates I05 so as to insure the ejection of the hinged lid produced in thematerial or tape worked upon. After ejection in this manner the hingedlids are slightly in relief, as a result of which the upper surface ofIt is known that the lids I25 take the form or position substantially asshown in Fig. 9, due to the inherent characteristics of the paper. suchas thinness and resilience. As the quality of the material worked upontends toward softness, the lids I25 assume a position in relief,substantially as shown in Fig. 8, wherein the plane of the lid I25 wouldtend toward parallelism with the plane of the body of the material orstrip I24. I

The tape, after being partially perforated in this manner, passes over atape feed roller H3 which is provided with a series of spaced fee'd pinsor projections H4 adapted to co-operate with the lidded feed holesformed by the feed punch and die plate. The feed roll H3 is providedwith a series of toothed grooves H5 which co-operate with a tape feedpawl H8 pivotally carried on the cradle 88 in well-known manner. Fixedto the shaft to which the feed roller H3 is secured is a star wheel H1(Fig. l) which co-operates with a detent member H8, pivoted at H8 to thebracket 82, having a spring I2I which urges the detent roller intoengagement with the star wheel H1. Fixed to the star wheel H1 is a thumbportion I22, whereby the feed roller H5 may be rotated manually eitherclockwise or counterclockwise. Therefore, to perform a backspacingoperation, the thumb portion 122 is rotated clockwise so as to move thetape rightwardly, as viewed in Fig. 5. In order that the perforated tapemay be readily moved rightwardlyfor a backspacing operation, each of theelector members I08 is provided with a case shift mechanism, whichcomprises means for shifting the platen II. As shown in Fig. 4 theplaten II is illustrated as consisting of a cylinder capped with a hardrubber (or other suitable) printing surface. PlatenII is removably heldin a block 88 slidably mounted on a wing portion I22 (Figs. Sand 11)having an inclined lower edge, so that as the tape is moved rightwardly,any of the hinged lids/which may be projecting upwardly at an angle willbe cammed downwardly by the wingportion I22 so as to clear the die platei051 In Figs. '1, 8, and 9 is illustrated a portion of the tape printedand/or perforated in accordance with the present invention. The tape I20is perforated in such a manner that the lids I25 are not completelysevered but are hinged or attached at their left sides to the tapematerial so that when the tape is introduced into a 'tape transmitter,the sensing pins will force the lids I25 upwardly and the pins willprotrude through the openings provided, therefor. As shown in Fig. '1,the printing appears directly over the hinged lids as if the tape hadnot been perforated and is readily legible. In the specific embodimentof the invention herein shown, the perforated code combination is sixsteps in. advance of the corresponding printed character.

That is, the code combination represented by the transverse row I28,Fig. '1, corresponds to the letter Q" in the word Quick." 01' course, itis understood that if a wider tape is provided, the characters printedcan be printed adjacent to the transverse row of code combinations ofperforations corresponding thereto. It is conceivable that tapes havingprepunched feed holes would be desirable under certain conditions. In

this event, the feed hole I50 (Fig. '1) would be indicated as fullyperforated instead of being provided with a hinged lid. Moreover,although I in the present embodiment the perforated record to actuateshift arm I28 rearw ar I28 is again latched byend'I18 of lever I18. It

shaft I00 which, in turn, is slidably supported in brackets 63 and I21.Fixed to shaft I00 is a collar I28 against which the block 88 is held bya spring I28 surrounding said shaft and compressed between block 88 anda shift arm I29 also fixed to said shaft. Block 88 is slidablerearwardly on shaft I00, through the instrumentality of an arm I30 flxedthereto, against the action of spring I28, to bring the platen II frombeneath the tape and inking ribbon, so that said platen thereby becomesaccessible for ready removability and interchangeability. The platen IIis also shiftable under the control of received code signals through themedium of shift actuating bar I14 and unshift actuating bar I15. PlatenII is shown in Fig. 2 in its unshift or letters position. To shift theplaten II to figures" position, the actuating bar I18 is collar I28thereon strikes against bracket t3.v

Since the relation between shift arm I28 and block 88 is unchanged, dueto the compressive,

action of spring I28, block 88 is shifted with the shaft I00 to' bringplaten II into the shift or figures position. To return platen II to theletters or unshift position (shown in Fig. 2) the actuating bar I15 isselected, which when raised by bail 52 rocks lever I8I about pivot I02,and in turn rocks member I82 about its pivot I38 until arm is manifestthat platen II is shiftable under two operating conditions, oneselectively in response to received code signals to shift or unshiftposition, and the other manually through the instrumentality of arm I80to render the platen II accessible and interchangeable.

The platen II is in the form of a cylindrical plunger and is adapted tofit closely loosely in block 88. Platen II is capped with asubstantially resilient printing surface so that upon each printingstroke of a type bar, its type face impinges against the printingsurface of the platen, causing, due to the percussive effect incident toprinting, said platen to bounce and vibrate slightly, thereby disturbingits position and causing it, when it shall have come to rest; to havechanged or altered its angular position somewhat; This action causes theplaten II to present a new and/or different angular position to theprinting element, thus tending to preserve the printing surface andprolong the life of the platen cap.

General operation Inthe operation of the apparatus according to thepresent invention, the motor 08 is conprecedes the corresponding printedrecord, it is possible to position the punch block 81 to the right ofthe platen II, as viewed in Fig. 4, whereby the printed record wouldprecede the corresponding perforated record.

As indicated in Fig. 1 each type bar I2 provided with two type faces,thus necessitating a 75 sidered to be running continuously, thusrotating the main operating shaft 25. the main operating shaft 25 aresleeve members rotatably associated therewith through clutch members, asdisclosed in Patent 1,745,633, which sleeves are normally held againstrotation. The selector magnet I1 is normally energized so that Carriedon its racir and asoeeee upon the receipt of a start impulse of spacingnature, the magnet ll is lie-energized. and. its armature lever 58 isreleased under the tension of spring 2% whereby the stud iii thereonurges the plunger e2 leftwardly to release through a series of lever(not shown) the sleeve members on the shaft $5 for rotation in timedrelation to abutments on the swords 35 and selector lever,

is are determinative of the positions of said swords to operate the rievers 55 to one or the other of their operative positions, the T-ieversin turn actuating the code bars to their rightward or leftward positionin accordance with the received code combination.

- In timed relation with the rotation of cam drum 35, the sleevecarrying the printing cam (not shown) and the periorator operating cam95 is initiated into rotation. The printing cam operates throughmechanism, not here shown but described and shown in said Patent3,745,633 to reciprocate the printing coil 52: which, on its upwardmovement, permits the actuating bars i i to respond to the pull or theirindividual springs to be urged into engagement with. the code bars it,one of these actuating bars finding an alignment of slots or notches inthe code hers is and thus traveling or rotating farther so as to bringits nook portion 55 into the path of the ball 52, so that the ball inits upward movement, picks up the hook portion 55 and raises theselected actuating bar to effect rotation of the type bar associatedtherewith through connection. The type pallet is therefore caused toimpinge i to "int a character on the the some time printing pus 1.1 pasoh the typ e bar it user d i s tion somewhat.

Simultaneously with the actuation of the type car for printing acharacter through the op= oration of the actuating bar it by priut hghail 52, the locking her G9 is permitted to respond to is the pull oiits sprine so that the upper of the locking oar ii) moves into the tnotches- 55 in the code bars to. hi so doing, the levers are permittedfollow this movement or the locking bar 351 in response to the action oisprings @571 (Fig. 1}. However, when any one of the code here is in itsrightward position, theshoulder oi lever will strike against said codeher and the corresponding cell crenir lever 58 will loiocireci againstmovement. l

Therefore, the-levers cell cranir levers ti 55, and interponentsassociated therewith will have no motion or movement imparted theretoand will assume the position opposite to that shown in Fig. d, that is,with the portion it of interpouent E3 in register with the punchHowever, when any one of the code bars 5 5 is in its leftward position,the shoulder oi lever will not be blocked by its associated code her itand will he permitted to rotate in a clock wise direction under theaction of spring ti through the interconnected levers t5, ti, and 58.This movement will cause the iuterponent 63 (Fig. 4) associatedtherewith to'be actuated leftwardly to bring the portion it of the interponentfiii out oi register or alignment with the punch it. In propertimed relation with these operations, the cam 95 for operating theperforator will actuate the perforating lever i9 clockwise, as viewed inFig. 4, so link it, the cradle 6t will be rocked clockwiseto bring allof the interponcnts 63, which have not been moved, into engagement withtheir re spective punches 13, thus urging said punches upwardly throughthe tape. As the cradle to is permitted to rock backward to itscounterclock= Wise position, the stripper plate acts to with draw thepunches i3, and the electors iiiii act to expel the hinged, lids fromthe die plate hi5. Thus, there is produced with the present invention aprinted and perforated tape, as shown in Fig. 7.

Modification Although the present invention been shown and described inconnectio r o certain specific embodiments thereof, it of courseunderstood that such disclosure is sorely illustrative and notrestrictive, ref being had to the app-ended claims to det e scope ofention, and all veri Log within uded claims not is claimed is: i. in s.recorder, recording mechanism comprising plurality of pivoted type bars,a resiliently capped cylindrical platen member, means for pivoting saidtype hers downwardly to coopwith said member to effect printing, and acarrier freely and otatably supporting said :41 member l ,v in responseto the pe said. type bars vito cause said member nsuraole amounts toalter the at of said member.

recording mechanism cornpool 1 reocrug a Zillli pris sits of pivotedtype bars, a rotata oioer, means for pivoting said type iv to cooperatewith said platen -tihg, and a carrier in which said platen is looselyand removahly inserted whereby in response to the percussive efiectproduce by said type bars vibratory forces are created. to cause saidmember to rotate incomro hicamounts to alter the angular posieaidmember.

ROSS A. LAKE.

that, through the.

